For non-html compatible email programs: http://www.rdlnet.com/newsletters/E-News_20081229.html

RDL Introduces TX-PCR1 and TX-PSD1 Paging Modules

The TX-PCR1 PAGING CONTROLLED RELAY triggers on an amplified paging signal to switch or mute speakers.

The TX-PSD1 PAGING SOUND DETECTOR pulls an open-collector output to ground when an amplified paging signal is detected

Both modules feature adjustable trigger sensitivity and release delay. The signal input may be 8 Ohm, 25 V, 70 V or 100V! LEDs make setup simple! Detachable terminal blocks make installation easy!

The TX-PCR1 or TX-PSD1 are ideal choices in many applications where switching needs to be controlled from a constant-voltage amplified audio source. Each module will trigger on any program material, with paging sources being the most common. The TX-PSD1 provides an open-collector SLAVE output while the TX-PCR1 includes both an open-collector SLAVE output to control other modules or equipment and a DPDT high power switching relay suited to switching speaker loads.

The amplified audio source is connected using a detachable terminal block. A front-panel switch is provided to select the source type: 25 V, 70 V or 100 V. The 25 V setting may be used for an 8 ohm, 75 Watt maximum, amplified source. Input sensitivity is adjusted on a single-turn trimmer. In the clockwise position, the SENSITIVITY trigger threshold is 30 dB below the switch-selected constant voltage. A red LED illuminates whenever the audio level exceeds the trigger threshold, facilitating the sensitivity adjustment.

The module is triggered when the audio exceeds the threshold and it remains triggered for a defined time duration after the audio falls below the threshold. This DELAY is adjustable from 3 to 25 seconds using a front-panel trimmer. Adjustment is simplified by a green LED that remains illuminated while the module is triggered. The SLAVE terminal may be used as either an input or output control terminal. When the module is triggered, the SLAVE terminal is internally pulled to ground through an open collector. If the SLAVE terminal is externally pulled to ground through a switch or the open-collector terminal of another RDL module, the relay will energize until the terminal is released.

Use the TX-PCR1 relay contacts to switch speaker lines or to control the logic inputs of other equipment with control inputs that may not be pulled up to 24 V. The TX-PCR1 is ideal to provide local speaker muting during an area page. The double pole contacts allow local speakers to be automatically connected to a paging line during a page and reconnected to the local amplifier when the page is completed. If additional speaker lines need to be switched, the SLAVE terminal may be used to control additional TX-PCR1 modules or RDL ST-LCR1H High Power Logic Controlled Relays.

Use the TX-PSD1 to control RDL modules or other equipment with ground activated control inputs that permit a 24 V pull up.